The 2021 Women's Six Nations Championship was the 20th series of the Women's Six Nations Championship, an annual women's rugby union competition featuring England, France, Ireland, Italy, Scotland and Wales. The format for the 2021 tournament was changed from the traditional eight-week round-robin format to a four-week format consisting of two pools of three teams with a final, inspired by the format of the Autumn Nations Cup, which replaced the 2020 Autumn Internationals. The tournament was held from 3 to 24 April 2021.